Effects Of Cottoondeed Meal And Different Fat Sources On Growth Of Grass Carp(Ctenopharynogdon Idellus)

This study was to find suitable source of protein through two experimental studies of protein and fat not affecting the growth of the fish cases cost savings.Experiment one:through cottonseed meal replacing 5% soybean meal, the experimental was to investigate the influence on the growth of grass carp, with rapeseed meal as protein soybean meal and seeds.20% of soybean meal feed was as control group. Five experimental groups on the basis of soybean meal firstly reduced to 15%, respectively after adding concentration of 0%,0.25%,0.35%,0.45%and 0.65% lysine hydrochloride (98%). Fish were randomly divided into 20 cages, with 60 fish. The experiment lasted for 8 weeks. The results are as follows:Weight gain rate, specific growth rate, feed coefficient were not influenced with 5% reduction in soybean meal feed (P>0.05). With the increase of the content of lysine HCL (98%), WG and SGR increased (P<0.05), FCR decreased (P< 0.05). The results showed that the grass carp fed diets with SBM supplementation with 5% CSM adding lysine hydrochloride (98%) has a significant improvement for WG (P< 0.05).Test two:The experimental study was to investigate various fat sources on WG in grass carp, soybean lecithin oil, peanut oil phospholipids, madtoms fish oil were as sources of fat. The eight experiment diets was supplied 1%,2%,3% soybean lecithin oil,1%,2%,3% peanut phospholipid oil and 1%,2% madtoms fish oil. Feeding trials was for 8 weeks, the results were as follows:WG and SGR increased with the increasing Soybean lecithin oil level, while FCR decreased, and there was a significant difference (P< 0.05); Compared with peanut phospholipid oil and madtoms fish oil, peanut phospholipid feed oil significantly improved growth performance and reduce feed coefficient (P<0.05). When adding 2% peanut phospholipid feed oil, CF was the lowest (P<0.05). When adding 1% peanut phospholipid feed oil and 2% soybean phospholipid feed oil, HSI was the lowest (P<0.05). The experimental results showed that with the increase of adding amount of soybean lecithin oil and madtoms fish oil, growth increased but not the peanut phospholipid. Compared with soybean lecithin oil and madtoms fish oils, growth increased significantly (P<0.05).